†Chitinozoa Eisenack, 1931 - chitinozoans Order †Operculatifera Eisenack, 1931 Family †Desmochitinidae Eisenack, 1931 Subfamily †Pterochitininae Paris, 1981 1 Genus †Armoricochitina Paris, 1981 2 Genus †Cingulochitina Paris, 1981 3 Genus †Pseudoclathrochitina Cramer, 1966 4 Genus †Pterochitina Eisenack, 1955 4.0 Genus Bion H. Lohmann (1904)